3b is a non-inverting amplifier that has the usual feedaback resistor (R044) and the highs cutting capacitor (C032), but - instead of a resistor - has a gyrator from the inverting input to ground. The gyrator is made with Q010, C034, C035, R046, R053 and R054. You can think it as a resistor that varies its resistance according to the frequency of the signal that passes through. A simulation would look like this:

3b is a non-inverting amplifier that has the usual feedaback resistor (R044) and the highs cutting capacitor (C032), but - instead of a resistor - has a gyrator from the inverting input to ground. The gyrator is made with Q010, C034, C035, R046, R053 and R054. You can think it as a resistor that varies its resistance according to the frequency of the signal that passes through. A simulation would look like this:

3b is a non-inverting amplifier that has the usual feedaback resistor (R044) and the highs cutting capacitor (C032), but - instead of a resistor - has a gyrator from the inverting input to ground. The gyrator is made with Q010, C034, C035, R046, R053 and R054. You can think it as a resistor that varies its resistance according to the frequency of the signal that passes through. A simulation would look like this: